No need for finding / calculating any phi or angle here. Just simpler than it is written.
Finding Perfect Squares
Most nonzero elements in row
Rotate a Matrix
Split a string into chunks of specified length
Sum of series I
Find the largest value in the 3D matrix
How many days does the cat take to climb out of the hole?
How long do each of the stages of the rocket take to burn?
Is this matrix orthogonal?
Find the definite integral of various linear functions
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